2004 INFINITI QX56 fluid

ATC-178
REFRIGERANT LINES
Revision: August 20072004 QX56
CAUTION:
Cap or wrap the A/C refrigerant pipe ends with a suitable material such as vinyl tape to avoid the
entry of contaminants.
4. Remove the expansion valve.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:

Replace the O-rings on the A/C refrigerant pipes with new ones, then apply compressor oil to them
when installing them.

After charging refrigerant, check for leaks.
Checking for Refrigerant LeaksEJS002DV
Perform a visual inspection of all refrigeration parts, fittings, hoses and components for signs of A/C lubricant
leakage, damage, and corrosion. Any A/C lubricant leakage may indicate an area of refrigerant leakage. Allow
extra inspection time in these areas when using either an electronic refrigerant leak detector (J-41995) or fluo-
rescent dye leak detector (J-42220).
If any dye is observed using a fluorescent dye leak detector (J-42220), confirm the leak using a electronic
refrigerant leak detector (J-41995). It is possible that the dye is from a prior leak that was repaired and not
properly cleaned.
When searching for leaks, do not stop when one leak is found but continue to check for additional leaks at all
system components and connections.
When searching for refrigerant leaks using an electronic refrigerant leak detector (J-41995), move the probe
along the suspected leak area at 25 - 50 mm (1 - 2 in) per second and no further than 6 mm (1/4 in) from the
component.
CAUTION:
Moving the electronic refrigerant leak detector probe slower and closer to the suspected leak area will
improve the chances of finding a leak.
Checking System for Leaks Using the Fluorescent Dye Leak DetectorEJS002DW
1. Check the A/C system for leaks using the fluorescent dye leak detector and safety goggles (J-42220) in a
low sunlight area (area without windows preferable). Illuminate all components, fittings and lines. The dye
will appear as a bright green/yellow area at the point of leakage. Fluorescent dye observed at the evapo-
rator drain opening indicates an evaporator core assembly leak (tubes, core or expansion valve).
2. If the suspected area is difficult to see, use an adjustable mirror or wipe the area with a clean shop rag or
cloth, then inspect the shop rag or cloth with the fluorescent dye leak detector (J-42220) for dye residue.
3. After the leak is repaired, remove any residual dye using refrigerant dye cleaner (J-43872) to prevent
future misdiagnosis.
4. Perform a system performance check and then verify the leak repair using a electronic refrigerant leak
detector (J-41995).
NOTE:

Other gases in the work area or substances on the A/C components, for example, anti-freeze, wind-
shield washer fluid, solvents and lubricants, may falsely trigger the leak detector. Make sure the sur-
faces to be checked are clean.

Clean with a dry cloth or blow off with shop air.

Do not allow the sensor tip of the electronic refrigerant leak detector (J-41995) to contact with any sub-
stance. This can also cause false readings and may damage the detector.
Dye InjectionEJS002DX
NOTE:
This procedure is only necessary when recharging the system or when the compressor has seized and must
be replaced.
1. Check the A/C system static (at rest) pressure. Pressure must be at least 345 kPa (3.52 kg/cm
2 , 50 psi). Expansion valve bolts : 4 N·m (0.41 kg-m, 35 in-lb)
A/C refrigerant pipe to expansion valve bolt : Refer to ATC-164, "
Compo-
nents" .

BR-1
BRAKE SYSTEM
F BRAKES
CONTENTS
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SECTION BR
A
B
BR
Revision: August 20072004 QX56 PRECAUTIONS .......................................................... 3
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 3
Precautions for Brake System .................................. 3
PREPARATION ........................................................... 4
Special Service Tool ................................................. 4
Commercial Service Tools ........................................ 4
NOISE, VIBRATION, AND HARSHNESS (NVH)
TROUBLESHOOTING ................................................ 5
NVH Troubleshooting Chart ..................................... 5
BRAKE PEDAL .......................................................... 6
Inspection and Adjustment ....................................... 6
INSPECTION ........................................................ 6
ADJUSTMENT ...................................................... 7
Removal and Installation .......................................... 8
REMOVAL ............................................................. 8
INSPECTION AFTER REMOVAL ......................... 9
INSTALLATION ..................................................... 9
BRAKE FLUID .......................................................... 10
On-board Inspection ............................................... 10
LEVEL CHECK ................................................... 10
Drain and Refill ....................................................... 10
Bleeding Brake System ...........................................11
BRAKE PIPING AND HOSE .................................... 12
Hydraulic Circuit ..................................................... 12
Removal and Installation of Front Brake Hose ....... 12
REMOVAL ........................................................... 12
INSTALLATION ................................................... 13
Removal and Installation of Rear Brake Hose ....... 13
REMOVAL ........................................................... 13
INSTALLATION ................................................... 13
Inspection After Installation .................................... 14
BRAKE MASTER CYLINDER .................................. 15
On-board Inspection ............................................... 15
LEAK INSPECTION ............................................ 15
Removal and Installation ........................................ 15
REMOVAL ........................................................... 15INSTALLATION ................................................... 16
Disassembly and Assembly .................................... 16
DISASSEMBLY ................................................... 16
ASSEMBLY ......................................................... 16
BRAKE BOOSTER ................................................... 17
On-Vehicle Service ................................................. 17
OPERATING CHECK .......................................... 17
AIRTIGHT CHECK .............................................. 17
Removal and Installation ........................................ 18
REMOVAL ........................................................... 18
INSPECTION AFTER REMOVAL ....................... 18
INSTALLATION ................................................... 19
VACUUM LINES ....................................................... 20
Removal and Installation ........................................ 20
Inspection ............................................................... 20
VISUAL INSPECTION ......................................... 20
CHECK VALVE INSPECTION ............................. 20
FRONT DISC BRAKE ............................................... 21
On-vehicle Inspection ............................................. 21
PAD WEAR INSPECTION ................................... 21
Components ........................................................... 21
Removal and Installation of Brake Pad .................. 22
REMOVAL ........................................................... 22
INSTALLATION ................................................... 22
Removal and Installation of Brake Caliper and Disc
Rotor ....................................................................... 22
REMOVAL ........................................................... 22
INSTALLATION ................................................... 23
Disassembly and Assembly of Brake Caliper
Assembly ................................................................ 23
DISASSEMBLY ................................................... 23
CALIPER INSPECTION ...................................... 24
ASSEMBLY ......................................................... 24
DISC ROTOR INSPECTION ............................... 25
BRAKE BURNISHING PROCEDURE ................. 25
REAR DISC BRAKE ................................................. 27
On-vehicle Inspection ............................................. 27
PAD WEAR INSPECTION ................................... 27
Components ........................................................... 27
Removal and Installation of Brake Pad .................. 28

PRECAUTIONS
BR-3
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MA
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BR
Revision: August 20072004 QX56
PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
EFS003P3
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WA RN ING:

To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.

Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.

Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
Precautions for Brake SystemEFS0062U

Refer to MA-10, "RECOMMENDED FLUIDS AND LUBRICANTS" for recommended brake fluid.

Do not reuse drained brake fluid.

Be careful not to splash brake fluid on painted areas.

To clean or wash all parts of master cylinder, disc brake caliper and wheel cylinder, use clean brake fluid.

Do not use mineral oils such as gasoline or kerosene. They will ruin rubber parts of the hydraulic system.

Use flare nut wrench when removing and installing brake tube.

Always check tightening torque when installing brake lines.

Before working, turn ignition switch to OFF and disconnect con-
nectors for ABS actuator and electric unit (control unit) or battery
terminals.

Burnish the brake contact surfaces after refinishing or replacing
drums or rotors, after replacing pads or linings, or if a soft pedal
occurs at very low mileage. Refer to BR-25, "
BRAKE BURNISH-
ING PROCEDURE" .
WA RN ING:

Clean brake pads and shoes with a waste cloth, then wipe
with a dust collector.SBR6 86 C

BR-10
BRAKE FLUID
Revision: August 20072004 QX56
BRAKE FLUIDPFP:KN100
On-board InspectionEFS003P9
LEVEL CHECK

Make sure the fluid level in reservoir tank is within the standard
(between MAX and MIN lines).

Visually check around reservoir tank for fluid leaks.

If fluid level is excessively low, check brake system for leaks.

If brake warning lamp remains illuminated after parking lever is
released, check brake system for fluid leakage.
Drain and RefillEFS003PA
CAUTION:

Refill with recommended brake fluid. Refer to MA-10, "RECOMMENDED FLUIDS AND LUBRI-
CANTS" .

Do not reuse drained brake fluid.

Do not let brake fluid splash on the painted surfaces of the body. This might damage the paint, so
when splashing it, immediately wipe off the area and wash away with water.

Before servicing, disconnect actuator connector or battery negative cable.
1. Connect a vinyl tube to each bleed valve.
2. Depress brake pedal, loosen each bleed valve, and gradually
remove brake fluid.
3. Make sure there is no foreign material in reservoir tank, and refill
with new brake fluid.
4. Rest foot on brake pedal. Loosen bleed valve. Slowly depress
pedal until it stops. Tighten bleed valve. Release brake pedal.
Repeat this process a few times, then pause to add new brake
fluid to master cylinder. Continue until new brake fluid flows out.
Bleed air from brake system. Refer to BR-11, "
Bleeding Brake
System" .
LFIA0225E
SBR4 19 C
SBR9 95

BRAKE FLUID
BR-11
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Revision: August 20072004 QX56
Bleeding Brake SystemEFS003PB
CAUTION:
While bleeding, pay attention to master cylinder fluid level.
1. Turn ignition switch OFF and disconnect ABS actuator and electric unit (control unit) connector or battery
negative cable.
2. Connect a vinyl tube to the rear right bleed valve.
3. Fully depress brake pedal 4 to 5 times.
4. With brake pedal depressed, loosen bleed valve to let the air out, and then tighten it immediately.
5. Repeat steps 3 and 4 until no more air comes out.
6. Tighten bleed valve to the specified torque. Refer to BR-21, "
Components" (front disc brake), BR-27,
"Components" (rear disc brake).
7. Repeat steps 2 through 6, with master cylinder reservoir tank filled at least half way, bleed air from the
front left, rear left, and front right bleed valve.

BR-12
BRAKE PIPING AND HOSE
Revision: August 20072004 QX56
BRAKE PIPING AND HOSEPFP:46210
Hydraulic CircuitEFS003PC
CAUTION:

All hoses and tubes must be free from excessive bending, twisting and pulling.

Make sure there is no interference with other parts when turning steering both clockwise and
counterclockwise.

The brake piping is an important safety part. If a brake fluid leak is detected, always disassemble
the parts. Replace applicable part with a new one, if necessary.

Be careful not to splash brake fluid on painted areas; it way cause paint damage. If brake fluid is
splashed on painted areas, wash it away with water immediately.

Do not bend or twist brake hose sharply, or strongly pull it.

When removing components, cover connections so that no dirt, dust, or other foreign matter gets
in.

Refill with recommended brake fluid. Refer to MA-10, "RECOMMENDED FLUIDS AND LUBRI-
CANTS" .

Do not reuse drained brake fluid.
Removal and Installation of Front Brake Hose EFS003PD
REMOVAL
1. Drain brake fluid. Refer to BR-10, "Drain and Refill" .
2. Using a flare nut wrench, remove brake tube from brake hose.
3. Remove lock plate and brake hose from bracket.
4. Remove union bolt and then remove brake hose from caliper assembly.
1. Actuator 2. Master cylinder 3. Brake booster
4. Connector
WFIA0278E

BRAKE PIPING AND HOSE
BR-13
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Revision: August 20072004 QX56
INSTALLATION
1. Install brake hose by aligning with the protrusion on caliper
assembly, and tighten union bolt.
CAUTION:
Do not reuse copper washer.
2. Insert brake hose end through bracket, then secure it to bracket
with lock plate.
3. Install brake tube to brake hose, then tighten flare nut using a
flare nut wrench.
4. Refill brake fluid and bleed air. Refer to BR-11, "
Bleeding Brake
System" .
Removal and Installation of Rear Brake Hose EFS003PE
REMOVAL
1. Drain brake fluid. Refer to BR-10, "Drain and Refill" .
2. Using a flare nut wrench, remove brake tube from brake hose.
3. Remove lock plate and brake hose from bracket.
4. Remove union bolt, and then remove brake hose from caliper assembly.
INSTALLATION
1. Install brake hose by aligning with the protrusion on caliper
assembly, and tighten union bolt.
CAUTION:
Do not reuse copper washers.
2. Insert brake hose end through bracket, then secure it to bracket
with lock plate.
3. Install brake tube to brake hose, then tighten flare nut to using a
flare nut wrench.
4. Refill brake fluid and bleed air. Refer to BR-11, "
Bleeding Brake
System" .
LFIA0214E
LFIA0213E
LFIA0212E
LFIA0213E

BR-14
BRAKE PIPING AND HOSE
Revision: August 20072004 QX56
Inspection After InstallationEFS003PF
CAUTION:
If a leak is detected at the connections, retighten it or, if necessary, replace the damaged part.
1. Check brake tubes and hose connections for fluid leaks, damage, twist, deformation, contact with other
parts, and loose connections. Replace any damage parts.
2. While depressing brake pedal under a force of 785 N (80 kg, 177 lb) with engine running for approximately
5 seconds, check for fluid leakage from each part.